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You can cut them now if you like - I did on several of mine in my back yard that would probably get trampled by deer over the winter. I leave the ones in the front (shown in picture) up until spring. It won't hurt either way - in the wild, they'd never be cut down.
For use in dried arrangements. They're a lighter (cinnamon) brown if cut in fall and a dark rich brown if cut in spring, so it depends what you like the best.